Select the most appropriate ANTONYM of the given word. Vigilant

Stagnant Dubious Robust Negligent

Negligent

The most appropriate antonym of the given word vigilant is negligent. Vigilant means being careful and alert, especially to possible danger. Negligent means failing to take proper care in a situation. Stagnant means not changing or developing. Dubious means doubtful or uncertain. Robust means strong and healthy.